无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (11): 121-129.doi: 10.19964/j.issn.1006-4990.2023-0049

• 环境·健康·安全 • 上一篇    下一篇

氯化铁溶液赤泥控碱作用及效果

岳远隋1(), 成官文1(), 徐敏1, 徐晓宇1, 张振林2, 农国武2   

  1. 1.桂林理工大学环境科学与工程学院, 广西 桂林 541006
    2.中国铝业股份有限公司广西分公司, 广西 百色 531499
  • 收稿日期:2023-02-03 出版日期:2023-11-10 发布日期:2023-11-16
  • 通讯作者: 成官文(1962— ),男,博士,教授,主要从事固体废物处置及矿山土壤修复研究;E-mail:1423076413@qq.com
  • 作者简介:岳远隋(1995— ),男,硕士研究生,主要从事赤泥碱性调控及矿山复垦研究;E-mail:1372623682@qq.com
  • 基金资助:
    中国铝业股份有限公司科技攻关项目(gxzz201903);广西重点研发计划项目(桂科AB20297039);矿泥土壤化处置示范及赤泥矿泥土壤化处置技术工程应用项目(gxzz202210)

Function and effect of ferric chloride solution in alkaline regulation of red mud

YUE Yuansui1(), CHENG Guanwen1(), XU Min1, XU Xiaoyu1, ZHANG Zhenlin2, NONG Guowu2   

  1. 1.College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
    2.Guangxi Branch of Aluminum Corporation of China Limited, Baise 531499, China
  • Received:2023-02-03 Published:2023-11-10 Online:2023-11-16

摘要:

针对赤泥碱性调控过程中存在的碱性强、控碱成本高等难题,以赤泥回收精铁矿生产的FeCl3溶液为控碱药剂,对赤泥进行控碱及陈化处置。结果表明:FeCl3溶液会使赤泥中可溶性钠碱含量显著降低,水化石榴石、方钠石等结合碱出现不同程度的溶解、转化,置换出的Na+、Ca2+等离子以石盐、CaCl2等矿相的形式在控碱赤泥表层结晶析出;Fe3+的吸附、聚集作用使得控碱赤泥表层孔径降低、比表面积显著增加、表面更为致密,致使药剂在赤泥控碱前期下渗缓慢,控碱效果受限;FeCl3溶液可以通过中和、沉淀作用显著降低赤泥碱分,控碱反应至30 d时整体控碱赤泥pH稳定在8.50左右,且随着陈化时间的延长其碱性并无显著反弹,反应、陈化历程可依次分为快速反应、迁移转化、溶解反弹、平衡构建4个阶段。

关键词: 赤泥, FeCl3溶液, 碱性调控, 矿相组分, 控碱机制

Abstract:

To address the problems of strong alkalinity and high cost of controlling alkalinity in the process of alkaline regulation of red mud,it was proposed that FeCl3 solution produced by recovering refined iron powder from red mud worked as an alkali control agent to control alkalinity and conduct aging of red mud.The results showed that FeCl3 solution could significantly reduce the soluble alkali,such as NaOH,Na2CO3,NaHCO3,NaAl(OH)4 in red mud,and the combined alkali,like hydrated garnet and sodalite,had different degrees of dissolution and transformation.The replaced Na+ and Ca2+ ions crystallized in the surface layer of alkali-controlled mud as halite,CaCl2 and other mineral phases.The adsorption and aggregation of Fe3+ made the surface pore diameter of alkali-controlled mud decrease,and the specific surface area was increased significantly,and the surface became compact accordingly,which made the agent penetrate slowly in the early stage of alkali control of red mud and limited alkali control performance.In addition,FeCl3 solution could significantly reduce the alkali content of red mud through neutralization and precipitation.After 30 days of reaction and aging,the pH of the red mud was stabilized at about 8.50,and there was no significant rebound in late aging.The reaction and aging process could be divided into four stages,such as rapid reaction,migration and transformation,dissolution and rebound,and balanced construction.

Key words: red mud, FeCl3 solution, alkaline regulation, mineral facies component, alkali control mechanism

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